It is always difficult to predict the height of a tsunami wave with great accuracy, since local water depths and coastal configurations can mean that a 2cm wave in one place is over 2 metres or very considerably more elsewhere.

Further, the first wave may not be the largest, and may also be preceded by a considerable lowering of water levels.

In addition to this, seiching may occur (as in Wellington Harbour with the 1855 tsunami), and rapid currents and changes in water level may continue for at least 12 hours after the first tsunami wave comes ashore.

The Indian Ocean December 2004 tsunami was only about 2 metres in height on arrival onshore.

Persistency and Determination...

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